Maybe no physical gift? I booked a baby sitter and getting mine a massage and taking him to a very nice dinner (a place I know he wanted to try).
Mine is the same and the only gifts he's liked were things someone has made...or really sentimental things.
We’ve done custom hats that match father/son and this year he got the portable camp chef that he wanted (like a multipurpose blackstone)
What his hobbies? My husband loves golf. He can never have too many golf things.